Flow controlling system



Aug. 30, 1932. Q ROWLEY 1,874,123

FLOW CONTROLLING SYSTEM Filed Dec. 5, 1928 ,5 Shgts-Shget 5 Aug. 30,1932. A. c. ROWLEY ,1 3

FLOW CONTROLLING SYSTEM Filed Dec. 5, 1928 5 Sheets-Sheet 4 5 g] fi y 21,5 zze /ZZ7 g e1 99 I 1oz 1, "'I/(III/IIIIIIIIII/III/ll J5 w v 1932- A.c. RQWLEY 1,874,123

FLOW CONTROLLING SYSTEM Filed Dec. 5, 1928 Z, llllljlllllllllll llfzuwia HWZAZWCJPOu/Z y Patented Aug. I 30, 1932 ems TTVES nit'rfiim o.nowiinY oF PHILADELPHIA, PF NsYLvAiaIA,- -essmnoit TO GLOBE Auro-PATIENT- FLow CONTROLLING SYSTEM Ap plication filed December 5, 1928."Serial ivo. 323,931;

This invention relates to improvements in fire extinguishin an aratusand relates morefl v b l 3 particularly to improvements in means for.

releasing and controlling the flow ofthe fire n F1gs.2to 6;

extinguishing agencies. V e

The principal object of the invention is to provide a novel and improveddevice operative under predetermined temperature conditions forreleasing a fire extinguishing. agent. 7 1 i V p More specifically, anobjectof the invention is to provide a device of the aforesaid characterwhich shall be extremely sensitive and positive in operation and whichwill not be adversely affected by changing conditions of atmosphere andtemperature and which will not deteriorate over long periods of time.

Another object of the invention is to. pro vide in conjunctionwith adevice of the afore-. said character novel apparatus adaptedforgenerating and releasing a fire extinguishing foam. v s

To this general end, the invention resides.

. in part in the provision of novel apparatus for releasing afoam-forming medium and for interrupting the flow of said medium after apredetermined period. 7

The invention further resides in certainnovel and useful structural andmechanical details hereinafter set forth and illustrated in the attacheddrawings, in which: Figure 1 is a general assembly view of. a-p-=paratus made in accordance with my invention; I

Fig. 2 shows in vertical section the release box and valve mechanismsforming a part of the apparatus Fig. 3 is a front elevation ofthe'release box and immediately associated valve parts as w w elementwhich reacts with the water entering shown in Fig.2; z

v Fi get is a front view of the release box with the cover removedshowing some ofthe in-. teri'or working parts;

Fig. 5 is a sectlonal 'view similar to Fig. 2

I but showing the parts in therelea'sed posit'i'on; s

Fig. 6 is a front elevation of the release box and the associated partsasfsh'own 1n Fig.6;

7 Fi 7 is s section on ts line m; Fi '6 Fig. 8 is a section on the line8-8 Fig. Fig-9 1s a plan-view of the thermosensivtivedevice constitutingone of the prime actuators of the release mechanism illustrated i 10 s asection an the line 10' 1'0,-Fi 1 Fi 11 is aside elevational vise of'thevalve on the line 10-10, Fig. 9.

'-With reference to the drawings, theapparatus illustrated comprises atank 1 which constitutes a mixing chamber for foam-formmg chemicals; thefoam constituting in the present instance the fire extinguishing ne-6.111111. Commonly, one .ofthe foam-forming elements is 'water, andinthe present in stance I have illustrated the tank connected through apipe 2 with a water main 3, the conne ctionbeing controlled by a valve4'. The

tainer or accumulator 1, and in the present nstance an alarm device 5connected to the pipe 2 is adapted to be actuated by water pressure inthis pipeto close an electric circuit'6 including a suitableelectricsignal.

"Preferably the pipe 2 has associated therewith a drain 7- of a'typ'eincluding a ballfloat which permits escape of relatively smallquantities of waterleaking past the valve 4: but functioning toflclosethe drain port when a large volume of water is admitted bythe opening ofthe valve; The alarm and drain elements associated with the pipe 2 asset forth above may be of standard type, and

' form no es'sential'par t of the present invention.

The tank I normally contains a chemical the chamber through the pip e'2to form a fire extinguishing foam, which latter accumulates in the tank1 and'escapes through a discharge pipe 8 located inthe' pres'entinstance at the bottom of the accumulator tank. I,

' The valve 4, see Figlll, is of'the'difi'erential type a'nd'comprisesthe valvep'roper 9 adaptedtos'e'at within the casinga's illustrated toclose the connection between the pipes 2 and 3. Extending upwardly fromthe valve tinuously, to elevate the valve stem and with it the valve 9from its seat;

The upper part of the valvecasing above the diaphragm 13 is. connectedthrough a pipe 15 with, a chamber-16 in a casing 17, in

which chamber is operatively mounted a valve 18, said valve beingadapted in alternate positions to close ports19 and2l. The.

port 19 communicates with a cylindrical chamber 22, which chamber inturn communi- 'cates through a bypass channel 23 wit-ha chamber 24 in acasing 25 integrally formed in the present instance with the casing 17,as

ill'ustratedin Fig. 7. 'Withinthe chamber 24 is mounted a valve 26adapted to seat as 1llus-- trated in Fig. 5 so as to break theconnection between the bypass 23 and a port 27, which through a pipe 28is connected to a suitable dram.

The valves 18and 26 are operatively connected by a stem 29 whichprojects through the walls of the-casings Hand 25 as illustrated inFigs. 2 and ,5. V ith this stem 29,

the valve 18 has a sliding connection, a spring 31 tendingto force thevalve'away from the end of the stem and the relative movement of thevalve with respect to the stem being limited by a shoulder 32, asclearly illustrated. This free movement betweenthe stem 29 and the valve18 insures thefirm seating of the valve 18 in the alternative closing ofthe ports 19 and 21. Associated with thestem 29'witha pressure tendingtoforce the valve 18 from in the chamber22 is a spring 33 which exertsits seat closing the port 19, as shown. in Fig. 2, into the. alternativeposition, as shown in I Fig. 5, in which it closes the port 21. The

stem 29 engages the valve 26 so as to hold this valve away from its seatwhen the valve 18 closes the port 19 and permits a'spring 34 to seattheva'lve 26, as shown in Fig.5, when the'valv'e 18 is in the positionclosing the port 21. The connection between the stem 29 and the valve 26is also a sliding one insuring a proper seating of the valve 26.

Intermediate the casings 17 and 25, the

stem 29 comprises a threaded sleeve which constitutes a means foradjusting the overall length of the stem and the relative positions ofthe end sections thereof, one end of this sleeve also functioning as avalvetofclose the opening in the casing 17 through which the stemextends, the valve being effective when the parts are as shown in Fig.5. r

The chamber 16 through the port 21 and a pipe 35 communicates with oneor more sprinkler heads 36,.see Fig. 1, of well known type which will belocatedwithin; the area ratus.

controlled by the fire extinguishing appa- The. chamber 16 also isconnected through the port 19 and through a pipe 37 having a second portwhich communicates through a pipe 46 with the water main 3; As

shown in. Fig. 1, this pipe'46 is controlled by a valve 47.. The casing42 compriseschambers'48 and 51 which communicate respectively with theports 43 and 45, and the chambers intercommunicate through a port 52 inwhichis established a stem 53 longitudinally grooved or recessed in thatpart which projects through the port and adapted to restrict the openingto a desired extent This stem .53 is supported in the inner end of aplug 54 threaded into the casing 42, the plug having a recess 55 in thebottomof which 7 the end of the stem 53is held by a spring 56,

this springv being held under compression by a plug 57 threaded into theouter end of said recess. The plug 54 ,alsocarries at its inner end acylindrical strainer 58 which-surrounds the projecting portion of thestem 53 and whose outer end fits against the partition 59 in suchmanner. as to completely surround the port 52.. The strainer 58 preventsany foreign materialin the Water from clogging the restricted port52. Vr

From the foregoing description, it will be apparent that withthe valve18 closing. the

port 19, as it normally will, water from the main 3 will fill the pipe46 and willpass through the restricted opening 52' into the pipe 15, andthrough this pipe to that portion ofthe valve casing 4 overlying thediaphragm 13 and also to the chamber 16 of the valve casing 17. The port21 of this casing bemg open, water will'alsofill the pipe 35. Underthese conditions, the valve 18 is held to its seat closing the port 19,and the main pressure upon the top of the diaphragm 13 of thedifferential valve 4 will also hold the valve 9 to its seat closing thepipe 2 and preventing passage of water from the main through said pipeto the accumulator 1. Also under these conditions, it'will be noted thatthe valve 26 is open whereby the casing 38 is connected through thepip'ej37 and the bypass 23 with the drain pipe 28.

Assuming now that thevalve18 is shifted to the alternative position, asshown in Fig. 5 closlng the port 21, it will be apparent that thechamber 16 will be connected through the chamber 22 and pipe 37 with thecasing'38,

thevalve 26 being closed and thereby disconnecting the chamber 22 fromthe drain. Also I the sleeve 8t) nowperforms its valve function toprevent leakage from the chamber 22 around the valve stem 29. Opening ofvalve which discharges through the pipe 8 and is directed as required.

By reason of the restricted character of the port 52, waterfrom the main3 gradually fills the casing .38 untihwhen this casing is completelyfilled and by reason of the automatic closing of the vent 39 by a floatvalve (notshown), the main pressure is again restored in the pipe 15,and acting upon the diaphragm 13' closes the valve '9, preventingfurther'flow of water from the main to'the j accumulator. The partsremain in this poupon the valve 1 8 is again held to its seat sitionuntil the Valves 18 and 26 have been restored to their originalpositions, as may be done by means hereinafter set forth, whereby themainpressure, closing the port 19, while the water in the casing38automatically escapes therefrom through the chamber 24 and the drainpipe 28, thereby restoring the apparatus to its original condition.

' turns about its pivot in a clockwise direction As previously stated,the chamber 16 is connected through the pipe 35 with one or moresprinkler heads 36, and it will be apparent that release of thesprinklerhead by reason of excessive temperatures at the place of itslocation will result in a release of pressure in the chamber 1'6,permitting the spring 33 to shift the valve 18 over into the alter Thenative position, as shown in Fig. 5. sprinkler head or heads, therefore,constitutes one means for releas ng the control valves of theaforedescribed apparatus to permit the formation of the foam in theaccumulator.

As shown in Fig. 2, I provide additional release means in the form of arelease box 61, which in the present instance is carried upon a bracket62, to which is secured the casings 17 and 25. Pivotally secured to thisbracket 62 at 63 is a lever arm 64 which extends downwardly through thespace between the casings 17 and 25 and is operatively connected withthe stem 29 so that oscillation of the lever results in a correspondinglongitudinal movement of the'stem, and vice versa.

Pivotally secured at 65 to the bracket 62 is a lever 66, this leverhaving a transverse-- 1y pro ect1ng lug 67wh1ch when the lever and asshown in Fig. 5 is adapted to engage the lower end of the lever 64. Theupper end" 7 of the lever 66 is prov'idedwith weights 68 of such sizethat when the lever 66 is released Influx of water into thefrom theposition shown in Fig. 2', as hereinafter set forth, they will cause theextension 67 to strike the-lever 64 with su-fiicient force to open thevalve 18 against the water pressure which normally holds this valve toits seat closing the port 19.

The lever 6G is normally supported, as shown in Fig. 2, an elevatedposition by a yoke 69 which passes over and engages an arm 71 of a bellcrank lever 72 pivotally se cured at to the frontof" the box 61 Theother arm of the bell crank lever 7 2eX-tends upwardly as shown in Fig.2'-

turns inwardly andd 'ownwa-rd l y through an opening 74in the frontcover of the box 6-l'to be engaged and normally held in the uprightposition, as shown, supporting the i'v'eig ht'68 by'a latch 75 in theform of a suitably shaped arm of a bell crank lever 7 6 pivotal-1ymo-unted at 77 within the box 61. The other infil 78 of this lever 76extends downwardly in the box, and its lower end is normallyengaged byan arm 79 of a secondpivoted lever 81 in the bottom of the box toprevent'oscil- V la-tion of the lever 76' in'al'clockwisddirec tion, seeFig. 2, to extentrel'asingthe arm 72. The lever 81 has a secoiidarn'i 8289 attached to the upper end of the latch re siliently holds the latterin an advanced position such that the part 86" overlies the inner end ofthe lever84.- I

The lower end of the latch 87 engages be hind the head 9'1 of a pin 92whiclr is'secured to a diaphragm 93-secured as illustrated over a dishedreceptacle 94, this receptacle having a port from whicl ra small pipe95ext ends through the side of the casing 61. Under atmosphericpressure within the receptacl'nn 94, the diaphragnr occupies theposition shown in Fig. 2, which permits the latch 87 under the action ofthe spring 89to assume a position inwhichthelever 84eng a ges under thelatch part 86, as described above and asillustrated in the aforesaidFigure lVhen the receptacle 94 is evacuated, as by" means hereinafterdescribed, the diaphragm 93' will be flexed inwardly, as shown in Fig.5, and; will thereby through the pin 92 oscillate th'e'"120 latch 87 toan extent releasing the arm 84.

Release of the arm 84" in th s-manner results in arelease of the arm 82,and thelever 81 is thereby permitted to oscillate inwardly to releasethe arm 78. The'l'ever 76 imda e- 125 ed to swinginwardly so ast'o-release the'arm 72 ofthe lever 73, which latter swings outwardly andreleases the weight 68 and-the lever- 66. In the downward movement ofthe latter, the transverse projection 67 ensufficient force actingthrough the stem 29 gages the forward edge of the lever 64 with to openthe valve 18, with the results described above. It will be noted that inaddition to the action of the weight 68 tending to oscillate the lever7172 outwardly from 98. Also a pivoted stop 99 is provided in the top ofthecasing which by engaging the latch arm 75 prevents forwardoscillation of the lever 76 after the rearward oscillation whichreleases the arm 72. An aperture 101 is provided in the :cover plate ofthe casing 61 whereby this stop 99 may be forced inwardly,

to release the arm 7 5 to permit the lever 6 to return to the normalposition, as shown in Fig. 2, and a spring 102 is provided which.

a normally tends to return the lever to this position. I In resettingthe parts to their original unsprung condition, the arm 7 2 is elevated,the weighted yoke 69 having been attached to the arm 71 and the uppercurved hook end of the lever 72 forced inwardly through the aperture 74and over thelatch arm 7 5.. The extremity of the arm 72 first engagesthe stop 99v and forces the latter inwardly, thereby releasing the arm 75, it being apparent that this latter arm cannot be elevated and theparts returned to their original positions until this look 99 has'beendisplaced. With the arm 7 2 in position as shown, the lever 81 may beoscillated in a clockwise direction by means of a knob 103 exterior ofthe casing 61 which through a shaft 104 is connected with this latterlever. wardly engages the under side of the lever 84 and must displacethis lever upwardly in order to clear the shoulder 83 which normallyholds the arm 82 in the advanced position. This displacement is providedfor in the slotted formation of the pivot hole, and a spring 90 isprovided to normally hold the lever in a depressed position at thepivot. The setting of the trip mechanism is completed by restoration ofnormal atmospheric pressure to the chamber 94, as by means here inafterset forth, which results in a return movement of the diaphragm 93 to thenormal position shown .in Fig. 2 and permits the spring 89 to return thelever 87 to a position in which the cross piece 86 is effective toprevent elevation of the outer extremity of the lever 84.

It will be noted that I have provided with- The arm 82 in moving outinthe casing a bell crank lever 105 the upper end of which is in positionto engage the end of the diaphragm pin 92, this hell crank lever 105beingconnected through a link 106 with i the upper end of the valvecontrolled lever 64. Under normal conditions, the lever .105:

occupies the position shown in Fig. 2. When i the valve 18 moves overinto the alternative pos tion, however, asshown in Fig. 5 and as occursfor example when the normal fluid pressure in the chamber "16 isrelieved by the opening of one or more of'the sprinkler heads 36, theaccompanying'movement of the stem 29. acting 'throughth-e lever 64 andlink 106 oscillates the lever 105 intocontaot with the pin 92 flexingthe diaphragm 93 inwardly and thereby releasing the trip mechanism andpermitting the lever 7 2 to drop.

' In resetting .the apparatus after actuation through the medium ofthesprinkler heads the possible overlooking of this essential resettingoperation, since the released position of the weights is an inescapableindication that the mechanism is not in operating condition. Propercomplete resetting is thus assur'ed.

Evacuation of the receptacle 94 as de scribed above is accomplished inthe present 36 as explained, it is necessary to withdraw instancethrough the medium of a thermosensitive device illustratedin Figs. 9 and10. This device comprises a casing 111 in which is established anexpansible element or sylphon 112. This sylphon is supported between ashoulder 113 in the top of the casing and a threaded closure member 114.This closure has a ort 115 which communicates with the interior of thesylphon and is controlled in the present instance by a gravityactuatedcheck valve 116 which permits air to pass from the interior of thesylphon but prevents a return flow of air through said port. which alsocommunicates with the interior of the sylphon and through the pipe 95with the chamber 94 of the trip mechanism.

In the interior of the sylphon 112 and reacting against the inner faceof the closure member 114. is a spring 118 which tends to extend thesylphon from the normal contracted position in which it is shown in Fig.10. In the present instance, the bottom of the sylphon is recessed at119, and in this recess is established a stem 121 which projectsdownwardly through a passage 122 in the threaded body portion 123 of athermosensitive release unit. The 'lowerend of the passage 122 isnormally stopped by a closure Theclosure 114 also has a port 117 member124 which is held to a seat on the body member 123 by a pair of strutmem-.

the :outer face of the closure member 12 1,

1- wliile the lower ends are braced respectively against the outer endsof a pair of levers 126. These levers 126 are engaged behind theinwardly beaded lower edge 127 of the body member 123, while the leversconverge to ;hear against the upper face of a washer 128 which isslidably mounted upon a stem 129 extending downwardly from the closure124. The washer 128 is normally held in an ele vated operative positionwith respect to the lever's'126 by a body of fus ib'le compound 131which is confined between the washer 128, a head 132 on the extremityofthe stem 129, and a cylindrical cover member 133- which embraces thehead 182 and a portion of the washer 128. v p

In operation fusion of the compound 131 permits the sleeve 128 to slideoutwardly on the stem 129, thereby releasing the inner ends of thelevers 126. The struts 125 are thereby also released so that the entireclosure member drops away to release the stem 121, thereby permittingthe spring 118 to extend the sleeve, which results, in an evacuationthrough the pipe '95 of the chamber 94 of the trip mechanism. In"resetting the latter mechanism, the sylphon is contracted and thestruts 125 and the thermosen'sitive release element restored to itsoriginal condition to thereby support the sylphon in the contractedposition. In the contractive movement of the sylpho-n, it is apparentthat any excess air in the system will be expelled through the port 115.

The operationof the apparatus as a whole will be apparent from thetoregoingdescription.

I claim: 7 1. A fluid system comprising a main duct, a differentialpressure valve controlling said duct, a branch duct providing mainpressure at the valve normally retaining it closed,

and means for relieving and subsequently restoring the pressure in saidbranch duct ineluding a timing chamber connected with 53 said branchduct and having an independent "drain, a second valve interposed anddirect ly controlling the connection between the branch duct and thesaid chamber and normally retained in the closed position by the [31119.111 pressure in said branch duct, and a third valve controlling thesaid drain and having a synchronized operative connection with saidsecond valve whereby when the latter valve is closed the drain valve isopened,

jand vice versa.

2. A fluid system comprising a main duct, branch duct, and a timingchamber connected with said branch duct and having-an independent drain,of a differential pressure i valve controlling said main duct andoperatively associated .with said branch duct whereby main pressure inthe latter ductnormally maintains the valve closed, a second valveinterposed between saidchamber and the branch duct, said valve'beingalso normally maintained in the closed position by the main pressure insaid branch duct and directly controlling the connection between thebranch duct and "the timing chamber,

means for c'losingsaid second valve, a third valve controlling the"drain'from said timing chamber and operatively connected with saidsecond valve whereby the opening of said second valve is efiective toclose the third valve and whereby the third valve is opened Whenthesecon'd valve is closed, and means tore'iiecting the opening otsaidsecond valve.

3. A fluid system comprising a main duct adaptedffor connection with asource of fluid 1 supply, a differential pressure valve controllingsalid duct, a timing chamber, a branch duct connecting the timing"chamber with the. main duct and also connected with said valve wherebythe mainfpressure is eftect'ive to normally retain the valveclo'sed, asecond valvecontrollin'g the connection between the branch duct and thetiming chamber and also normally retained closed by said. main pressure,a single restriction in said branch duct effecting the flow iromthe mainduct toboth of said valves and to the timing chamber, means forefi'ecting th'e opening of the second valve, an independent drain forsaid timingch'amber, a third valve operatively connected with saidsecond valve and controlling'said drain, I

means for closing the said third valve by the opening movement of thesecond valve, and means for restoring said second valve to its seat andfor simultaneously opening the third valve to permit said timing'chamberto drain.

LA fluid, system comprising a pressure duct, a'con'tainer, a valvecasing having a chamber connected with said pressure duct,

and 'avsecond chamber connected with said container, and a portproviding communicationbetween said chambers, valve means controlling;the said port including a stem projecting through the wall of saidsecond chamber, said stem comprising a part effective to seal theopening v1n said second chamber through which thestem projects, andmeans for shifting the stem to open the valve and simultaneously tobring. said sealing part into operative position with respect tosaidopen- 5. In a: fluid'system, the combination with a pressure duct, of acontainer, a valve casing having a chamber connected with said pres sureduct, and a second chamber connected with said container, and a portconnecting said chambers, a valvecontrolling the connectionbetween saidchambers and adapted normally to be held closed by the pressure in aidduct, a valve-actuating stein projecting through the wall of said secondchamber and having a part adapted to seal the opening in saidsecondchamber through which the stem ,projects,'means for actuating said stemto.

open the valve and to seal said Opening upon vrelief of the closingpressure, thermosensi-' tlv'e means for relieving said pressure, meansfor actuating said stem. to open the valve againstthe closing pressureincluding thermosensitive trip mechanism, and an operative connectionbetween the valve stem and the trip mechanism whereby actuation of thestem by relief of said pressure results in a release of the said tripmechanism and operaupon relief of said pressure to shift the'firstnamedvalve from its normal seat to the alternative position closing the otherport.

7. A fluid system comprising a pressure ,duct, a pairof portscommunicating with said i duct, a valve adapted in'alternative positionsto individually close said ports and adapted normally tobe held to aseat closing one of ,said ports by the pressure in said duct-,athermally-actuated valve normally preventing flow through theother ofsaid ports and adapted when open to relieve the pressure in the duct,and means for shifting the firstnamed valve from its normal seat to thealternative position closing the other port.

8. In a fluid system, the combination with a'pressure duct, of acontainer, avalve casing having a chamber connected with saidpressureduct, a second chamber connected with said container, and a portconnecting said chambers, a valve controlling the connection betweensaid chambers and adapted normally to be held closed by the pressure insaid duct, a valve-actuating stem projecting through thewall of saidsecond chamber and having a part adapted to seal the opening in saidsecond chamber through which the stem projects, means for actuating saidstem to open the valve and to seal said opening upon relief of theclosing pressure, means for relieving said pressure, means for actuatingsaid stem to open the valve against the closing pressure includingthermosensitive trip mechanism, and an operative connection between thevalve stem and the trip mechanism whereby actuation of the stem byrelief of said pressure results in a release of said trip mech anism andoperation of said second stem-actuating means. 7 V

9.7 In a fluid system, the combination with a pressure duct, of acontainer, a valve casing having a'chamber connectedwith said pressureduct, a second chamber connected with said container, and a port"connecting said chambers, a valve controlling the connection betweensaid chambers and adapted normally to be held closed by the pressure insaidduct, a valveactuating stem projecting through'the wall of saidsecond chamber, 7

means for actuating said stem to open the valve upon relief of theclosing pressure, thermosensitive means for relieving said pressure,means for actuating said stem to open the valve against the closingpressure including thermosensitive trip mechanism, and an operativeconnection between the projecting portion of said valve stem and thetrip mechanism whereby actuation of the stem by relief of said pressureresults in a release of the said trip mechanism and operation of thesaid second stem-actuating means.

10. In a fluid system, the combination with a pressure duct having apair of ports, of a valve normally held in position closing one of saidports by thepressure in said duct and the other of said ports, a secondvalve normally preventing flow through the last-named port and adaptedwhen open to relieve the pressure'in the -duct,means for moving thefirst-named valve from its normalposition to the alternative positionwhen pressure in the duct is relieved by the opening of said secondvalve, means including trip mecha nism and operative to unseat thefirst-named valve against the duct pressure, and means operativelyconnecting the first-named valve with the trip mechanism whereby theunseating of the valve by the valve-actuating means first named resultsautomatically in actuation of the trip mechanism and release of thesecond valve-actuating means.

h ARTHUR C. ROWLEY.

movable into an alternative position closing 7

